Question

# Why is phosphorus stored in the water?(A) It is very reactive(B) It does not react with water(C) It reacts with air and catches fire(D) All of the above

Hint: We should know that phosphorus is an element of the nitrogen family. The reason for the storage of a substance in a particular material is to preserve the substance in its actual form otherwise its contact with some environmental factors can lead to its deformation.

White phosphorus is a soft, waxy, flammable substance, consisting of tetrahedral $P_4$ molecules; it is often slightly yellowish because of the presence of impurities. It is highly reactive and spontaneously ignites at about 30°C in moist air. It is usually stored underwater, to prevent exposure to the air.
$P_{ 4 } +5O_{ 2 } \rightarrow P_{ 4 }O_{ 10 }$